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This sounds like a bug - have you submitted a ticket to support?
I have had similar issues on a few sites that usually comes from BC not having the zip codes in their database. Do you see a pin point in the middle of the ocean? If so then that particular zip code for that web app item isn't in the database, in which case contact support and have them add the zip code.
If you don't see a pin point, I'm guessing maybe your default search radius might be way to large and it's trying to fit everything onto the screen within the search radius?
Try setting the search radius to various levels and see what results you get and either way maybe contact Support with a list of specific zip codes being used to make sure they are in their database.
I think that's the case, non existent postal codes.
However since i've posted this, we've moved away from using this feature.
I'll test it again and verify.